SM31
SM31-044
Type and origin
Power typeDiesel-electric
BuilderPoland Fablok
Model411D
Build date1976-1985
Total producedca. 200
Specifications
Configuration:
​
 • UICCo′Co′
Gauge1,435 mm (4 ft 8+1⁄2 in)
Bogies2
Wheel diameter1,100 mm
Length17 m
Loco weight116.4 t
Fuel typediesel
Prime movera8C22W
Engine typefour-stroke
Cylinders8
Transmissionelectrical
Loco brakeOerlikon
Performance figures
Maximum speed80 km/h
Power output880 kW
Career
OperatorsPKP
ClassPoland SM31
Number in class168
NicknamesTrumna
Delivered1976

SM31 (production model 411D) is a Polish series of diesel shunting locomotives used by PKP and industry.[1]

History

SM31 class had been designed for shunting heavy freight trains in large freight stations, works and harbours. The design was elaborated in Fablok in 1973, mainly on the basis of SM42 locomotive. Production of this series lasted between 1976 and 1981, as well as between 1983 and 1985. In this period PKP bought 167 items of this series machines.[2] A total number of ca. 200 locomotives was produced, with the rest of them servicing Polish industry, chiefly mining.[3] Also first two prototypes (SM31-001 and SM31-002) were sold to industrial works, and the last one locomotive for PKP was re-bought from the industry (SM31-170).[2]

As the main purpose of this series was shunting heavy freight trains, after its introduction PKP possessed shunters suited for all purposes. For extremely light trains mainly SM03 locomotives were used. Medium light trains were shunted by SM30 series, medium weight trains were left for SM42 engines. The last thing to be done was the introduction of heavy shunter able to work in severe climatic conditions, what did not happen before SM48 were brought to Poland.[1]

Today SM31 locomotives are mainly to be found on Upper Silesia railway tracks, pulling heavy freight trains from works to marshalling yards in Łazy, Jaworzno, Szczakowa, Tarnowskie Góry and Rybnik. Other engines are deployed at the stations of Łódź, Nowy Sącz, Poznań, Szczecin and Wrocław.[2]

Technical data

SM31 is a Co-Co locomotive, what means it runs on two bogies, each equipped with three axles. Bogies are similar in construction to those used in SU45 and SU46 locomotives. This gives SM31 locomotive good performance on highland tracks.[2] Being a typical shunter, SM31 has one crew compartment of the same height as machine and electric compartments.[1] The engine (V8 compression-ignition engine) is in fact a developed version of SM42 locomotive engine, with its total power raised by ca. 50%. The engine propels main alternator, which gives power to six 196 kW traction motors.[1]

Nicknames

Trumna (En.: Coffin) - from locomotive's angular shape.[3]

References

  1. 1 2 3 4 Jarek D. Stwarz (1997–2002). "Chester Home Page". Archived from the original on 2007-08-31. Retrieved 2007-09-03.
  2. 1 2 3 4 "Regionalny Portal Kolejowy". 2006–2007. Archived from the original on 2007-05-09. Retrieved 2007-09-04.
  3. 1 2 Przemysław Gołembiecki, Tomasz Gacki (2003). "Serwis Kolejowy". Archived from the original on 2008-01-05. Retrieved 2007-09-04.
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